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Investigations into the effects of biofilm formation on the transport behavior of microplastics in open channel flows
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Researchers found that biofilm growth on low-density polyethylene microplastics significantly increases their settling propensity in open-channel flow, with biofilm-colonized 100 µm PE particles showing greater vertical movement than uncoated polyester particles despite PE's lower inherent density.
The presence of biofilm on microplastics (MPs) influences their mobility in aquatic environments by modifying critical physical attributes such as size and density. This study examines how biofilm-induced alterations affect the transport characteristics of polyethylene (PE) and polyester in open-channel flow. A laboratory incubation experiment lasting 7 weeks was performed under a regulated light-dark cycle to observe biofilm growth on low-density polyethylene (LDPE). Findings revealed that biofilm thickness increased rapidly within the first 7 days and stabilized by day 21. Subsequently, an empirical growth equation was established from these observations and consistently applied to both PE and polyester particles. Employing this calibrated model, particle tracking simulations were implemented for MPs (25 to 200 μm) within fully developed open-channel flows. The simulation results demonstrate that biofilm accumulation markedly enhances the settling propensity of both polymers. Biofouled PE particles with an initial diameter of 100 μm showed increased vertical movement compared to smaller polyester particles, and PE particles below 50 μm also exhibited more pronounced settling than uncoated polyester despite having lower density. These findings reveal that biofilm development can intensify the sinking of inherently buoyant MPs, thereby altering their transport processes. The results underscore the importance of accounting for biofilm-mediated modifications in both particle size and density to enhance the accuracy of MP fate predictions in riverine systems.
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Researchers experimentally measured how biofouling alters the settling velocity of microplastic particles, finding that biofilm growth on buoyant plastic fragments caused them to sink more rapidly. The results demonstrate that biological colonization of plastic surfaces is a key mechanism driving the vertical transport of microplastics from surface water to the seafloor.
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Researchers conducted laboratory settling experiments and modeling to understand how physical properties of microplastics influence their settling velocity and transport behavior in aquatic environments. They found that biofilm colonization significantly increases settling rates, suggesting that biofouling is a key factor controlling microplastic fate and distribution in rivers and lakes.
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